JS8Call, Flex 8000 series, SSDR v4.13, Windows 10

1_Flex_newbee.1

I struggled to get the CAT command to work, so searched various posts going back a while and tried various suggestions to no avail.
The following may help as it works for me:

JS8-Under Settings, choose Radio Tab, Rig: I eventually used Kenwood TS-2000, Rig Options: Set PTT Method to CAT, (Port: COM8 greyed out, I think was determined by settings in SmartSDR Cat), Choose Data/Pkt, and Split None.

CAT Control - Serial Port: Com 8, Baud Rate: 19200, Data Bits, set all 3 to Default

Audio: I chose DAX Audio RX 1 and DAX TX. Notification Soundcard, I chose the display my PC used

SmartSDR CAT: Edit CAT Port, add a Name, Protocol: CAT, Port Type Serial, FlexVSP, COM8, VFO Slice A, Auto Switch TX Slice: Enabled, Split Mode: Defaults to SO2R (normal)
When the software is operating, Process: The name you have chosen will show here.

73

Mike-VA3MW

The setup for JS8Call is the same was WSJT.

SmartSDR CAT does emulate Kenwood commands, so just about any current Kenwood model does work.

If you want a bit of background on how it all connects together, this video is worth the time.

https://youtu.be/RXeMMayB3-o?si=qHxeZi32_lXLifJ3